Piston for engines and like cylinders.



G. F. MORT.

PJSTON FOR ENGINES AND LIKE CYLINDERS.

APPLICATION FILED JULYIO. 1917.

2 SHEETS-SHEET I.

1 ,257,098, a Patented Feb. 19, 1918.

6. F. MORT.

PJSTON FOR ENGINES AND LIKE CYLINDERS.

APPLICATION FILED JULYIO. 1917.

Patented Feb. 19, 1918.

2 SHEETS-SHEET 2.

GEORGE FREDERICK MORT, OF EALING COMMON, ENGLAND.

- PISTON FOB, ENGINES AND LIKE CYLINDERS.

Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed July 10, 1917. Serial No. 179,615.

To all whom it may concern:

Be it known that I, GEORGE FREDERICK Mom, a subject of the King of Great Britain, residing at 3 Leopold road, Ealing Common, in the county of Middlesex, England, have invented certain new. and useful Improvements in Pistons for Engines and like Cylinders, and of which the following is a specification.

This invention relates to pistons for engines and like cylinders, and is. applicable with particular advantage to pistons employed in explosion engines and especially to such pistons where the walls are thin, as is particularly the case in steel pistons of thls class, although it is not desired that the invention should be limited to the latter type of piston. In such pistons 'which are adapted to carry a piston pin extending transversely acrossthe interior of the whole piston from wall to wall, it is usual to construct upon diametrically opposite sides of the piston, tubular sleeves extending from the interior wall, through which sleeves the piston pin is inserted, and upon the central portion ofwhich pin the small end of the connecting-rod takes and has its bearing, and the piston pin is commonly fixed by a bolt or screw passing in the interior of thepiston through the inwardly extending sleeves of the piston and through the piston pm.

To this construction of piston certain disadvantages are inherent, since the walls of the piston are liable to distortion, and the inwardly extending sleeves are not sufliciently supported and are liable to aid in the distortion of the walls of the piston, and moreover the piston in .is commonly not held with sufiicient rigldity to prevent undue wear in the bush at the small end of the connecting-rod and this is especially the case. when the piston is formed of steel and machined out.

lhe object of this invention is to overcome these disadvantages by providing an improved construction of piston as hereinafter particularly described with reference to the accompanying drawings, whereon Figure 1 shows on the left hand side a half section of a piston constructed according to this invention, "on a plane containing the axis of the piston and the axis of the piston pin; the right hand half of Fig. 1 shows the pistor in elevation.

At Fig. 2 the left hand half shows a horizontal section taken on the line XY of Fig. 1, and the right hand half is a horizontal section taken on the line X -Y of Fig. 1.

At Fig. 3 the left hand half is a section taken through the center of the piston at right angles to the section shown at Fig. 1; the right hand half of Fig. 3 is an-elevation of the piston corresponding to the section shown at the left hand half.

Fig. 4 is a vertical section taken on the line X Y of Fig. 2, a portion of the upper part of the piston being broken away.

Referring to the accompanying drawings, the piston is as usual composed of a hollow cylindrical structure open at one end and closed at the other and is formed externally with the usual grooves 1 to receive the packing rings (the latter not being illustrated in the drawings), and upon diametrically opposite sides of the piston there are two inwardly extending sleeves 2, 3 to receive the piston ,pin indicated by dotted lines at 8 Fig. 2. To support each sleeve, according to this invention, two webs extend from the piston horizontally (considering the piston in the position it is shown in the drawings) one being an upper web 4, see Fig. 4, and the other a lower web 5, the webs 4 and 5 are suitably spaced and connect the upper. and lower parts of the sleeve and the wall of the piston. A vertical web 6 also extends from the piston wall at right angles to the axis of the sleeve in the direction of the chord of an arc of the piston and is connected to and supports the inner end of the sleeve; the cylindrical wall of the piston is discontinued on each side of the sleeves 2 and 3, so forming recesses 7 externally of the piston. As illustrated in the drawing the sleeves 2, 3 and webs 4, 5 and 6 are preferably made as integral parts of the walls of the piston.

Thus considering one side of the piston, the piston webs 4 and 5 which extend horizontally inward on ,each side of the piston pin sleeve 2, form the tops and bases of the recesses 7, and the web 6 forms the vertical sides of the recesses 7; by these means the sleeves 2 and 3 are supported above and below by the horizontally inwardly extending webs 4 and 5 and also at their ends, so the said sleeves do not rely as hitherto upon the thin circular wall of the piston for support, and thus the said piston 1s not liable to distortion, the rigidity of the piston is increased, and the piston pin can be fitted in an easier manner than hitherto without fear of throwing the piston wall out of true.

Moreover, when the piston pin is to be fixed, the external recesses 7 thus existing enable pins, bolts, or screws, one of which is indicated by dotted lines at 9 Fig. 2, to be passed from the exterior of the piston through the sleeves 2, 3 and through the piston'pm in a direction at right angles to the axis of the piston. In some cases of course the piston pin mightv be allowed to rock in bearings formed in the sleeves 2, 3, and the connecting-rod might be fixed to the piston pin, and when such an arrangement is adopted (which arrangement the construction of the piston is admirably adapted to suit) the sleeves are efliciently su ported, and the whole piston forms a ri'gi structure.

What I claim as my invention and desire to secure by Letters Patent is 1. A piston for engines and like cylinders comprising a hollow cylindrical structure open at one end and closed at the other, an inwardly directed sleeve extending from the cylindrical piston wall to receive a piston pin, two interior p'arallel webs for said sleeve ocated at a distance apart and extending from the piston wall and connecting the same with'the u per and lower parts of said sleeve, and a we extending interiorly from the piston wall in the direction of the chord of the arc of the piston and in a plane parallel to the axis of the piston and connecting the inner end of the sleeve and the .upper and lower webs aforesaid to support the sleeve and the piston wall.

2. A piston for engines and like cylinders comprising a hollow cylindrical structure open at one end and closed at the other, two inwardly directed sleeves extending from the cylindrical piston wall and located diametrically opposite to each other 'to receive a piston pin, two interior parallel webs for each sleeve located at a distance apart and extending from the piston wall and connecting the samewith the upper and lower parts of said sleeve, a web for each sleeve extending interiorly from the piston wall in the direction of the chord of the arc of the piston, and in a plane parallel to the axis of the piston and connecting the inner end ofsaid sleeve and the upper and lower webs aforesaid to support the sleeve and piston wall, said piston having external recesses one at each side of each of the sleeves constituted by discontinuing the piston wall on each side of each sleeve between said upper and lower webs and said vertical web to permit the piston pin to be fixed in said sleeves from the exterior of said piston.

'3. A pistonfor engines and like cylinders comprising a hollow cylindrical structure open at one end and closed at the other, two

inwardly directed sleeves extending from the cylindrical piston wall and located diametrically opposite to each other to receive a piston pin,:two interior parallel webs for each sleeve located at a distance apart and extending from the piston wall and connect ing the same with the upper and lower parts of said sleeve, a web for each sleeve extending interiorly from the piston wall in the direction of the chord of the arc of the piston and in a plane parallel to the axis of the piston connecting the inner end of said sleeve and the upper and lower webs aforesaid to supportthe sleeve and piston wall, said piston having external recesses one at each side of each of'the sleeves constituted by discontinuing the piston wall on each side of each sleeve between said upper and lower webs and the-vertical webs aforesaid, a piston pin passing diametrically across said piston and through said sleeves, and a pin passing at right angles through each sleeve and through the ends of said piston pin located therein.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

GEORGE FREDERICK MORT.

Witnesses v THOMAS WILLIAM-ROGERS, WmLIAMA. MARSHALL. 

